Improvement in hydraulic elevators



UNITED STATES PATENT CFFICE.

PETER J. BORGER, OF CINCINNATI, OHIO, ASSIGNOR TO LANE & BODLEY,

OF SAME PLACE.

IMPROVEMENT IN HYDRAULIC ELEVATORS. I

Specification forming part of Letters Patent No. 181,761, dated August29, 1876 application filed March 9, 1875.

load, the long stroke being adapted to raisea heavy load, with a certainconsumption of water, and the short stroke to raise a light A load, witha corresponding decrease in the consumption of water; and my inventionconsists in such a construction and arrangement of the sheaves on oneend of the cylinder that they are divided into two sets of any desirednumber each, one set fixed to the cross-head of the piston-rod, so as toalways move with it, and the other set adapted for connection with, ordisconnection from, said cross-head set, so that the detachable set mayremain localized, and act alone as idlers, or

may travel with the cross-head set, and .thus act as multiplyingsheaves,to give a long stroke to .the platform, with a short stroke of thepiston.

My invention further consists of peculiar devices for securing andreleasing the detachable set of sheaves.

Figure 1 is a perspective view of my machine, with the detachable set ofsheaves localized. Fig. 2 is a perspective view of the machine with thedetachable set of sheaves released from the localizing device, and inposition to travel with the piston.

A is the cylinder, adapted to receive the supply of water and pressurefor the operation of the platform. B is the platform, and U thehoisting-rope. D is the piston-rod,

and E the cross-head. F is a frame, which includes the waysf, on whichthe cross-head E moves, the cross-head having projections e, to fit andmove in the ways. In the crosshead E the sheave-wheels G G are journaledto freely revolve, and a shaft, H, is provided, upon which thesheave-wheels I I revolve, the shaft being rectangular at the ends, orotherwise adapted to slide in the ways f.

Hooks J ,secured to a cross-shaft, K, so as to swing, are provided, toengage, as-shown the shaft H is localized or rendered stationary by thedropping of the hooks, the outer edges of the hooks will be in contactwith the projections L, and thus a solid lock is provided, whichrelieves the hooks from the strain of the machine.

When'the hooks are raised the shaft H is permitted to occupy a place inthe concave bearings e of the cross-head, as seen in Fig. 2, and totravel with said cross-head, the weight of the load acting to keep theshaft H properly in place in bearings e.

The pulleys or sheave-wheels G G I I 0011- nect by rope O with the setof sheave-wheels M M M M, which are suitably stationed to receive therope and conduct'it to the platform.

When the sheaves I I are stationed as in Fig. 1, they simply act asconductingsheaves or idlers, and do not affect the velocity of theplatform or the velocity of the piston, and in this arrangement thetraveling sheaves G G suffice to give the platform four times thevelocity of the piston. The full stroke is then given to the piston, andthe full power of the machine to raise a-heavy load is developed.

When the shaft of the sheaves I I is secured to the cross-head E, so asto travel with it, all the sheaves G G I I act to increase the speed ofthe platform, and the platform receives a velocity of eight.times thatof the piston, and the power of the machine thus lessened, is adapted toraise a light load with a proportionate decrease in use of water.

Thus I avoid the necessity of using a cylinder full of water for eachelevation of the platform, as is customary in hydraulic elevators usedheretofore. r

I claim 1. In a hydraulic elevator, the combination of traveling sheavesG G and sheaves I I,

adapted to be localized, or to be connected so L, operatingsubstantially as and for the puras to move with the sheaves G G,substaupose specified.

tialiy as and for the purpose specified. In testimony of which inventionI hereunto 2. The combination of the set of sheaves set my hand. G G,set of sheaves I I, and connecting-hooks J, opera ting substantially asand for the purpose specified. 1 Witnesses 3. The combination of set ofsheaves G G, EDGAR J. GROSS, set of sheaves I I, hooks J J, andprojections J. L. WARTMANN.

PETER J. BORGER.

